JP2008172928A - Resin molding device and method for stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily remove needless resin made in the process of sealing a stator with resin from a lower mold. <P>SOLUTION: A resin molding device 1 includes an upper mold 3 and the lower mold 4, and a stator 2 is arranged in the recess 29 of the lower mold 4, and resin is injected into a cavity made at closing of the mold thereby sealing the winding of the stator 2 with resin. This device 1 includes a resin injection port 15 which is provided at the center of the upper mold 3, a center post 30 which is provided in the recess 29 of the lower mold 4, a space part which is made between the post 30 and the upper mold 3 at closing of the mold and serves as a passage for resin supplied from the injection port 15, the narrowest part where the space part becomes narrowest at the peripheral end of the post 30, spool eject pins 27 and 27A which are provided in the lower mold 4 so as to push up a needless spool F injected from the injection port 15 and fixed in the space part, and a stator eject pin 26 which is used to push out the stator 2. The eject pins 27 and 27A are so arranged as to push it up behind the eject pin 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resin molding apparatus and a resin molding method for resin-sealing a stator for a motor.

  Conventionally, as this type of technology, for example, a “stator mold jig” described in Patent Document 1 below can be cited. The jig includes a first mold jig and a second mold jig arranged above and below the stator core, and a third mold jig arranged on the inner peripheral side of the stator, and the first and second mold jigs. A cavity for accommodating the winding portion is formed between the outer periphery of the stator core by the molding jig and the third molding jig on the inner periphery side of the stator core. Thus, only the winding portion of the stator is resin-molded (resin-sealed).

JP 2004-48957 A JP 2003-32979 A

  However, in the jig described in Patent Document 1, although only a winding portion is insulated and fixed by a resin mold, a small, lightweight and highly reliable rotating electrical machine can be obtained, but between the winding portion and the injection opening. It was necessary to remove the resin (unnecessary part) solidified in step (b). For this reason, a special process is required to remove unnecessary portions, which increases costs.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin molding apparatus for a stator that can easily remove unnecessary resin produced in the process of resin-sealing the stator from the lower mold. The object is to provide a resin molding method.

  In order to achieve the above object, the invention described in claim 1 is characterized in that an upper die and a lower die for closing and opening the die are provided, and a stator having a winding provided on the inner peripheral side is disposed in the recess of the lower die. In a resin molding apparatus for a stator in which the stator winding is resin-sealed by injecting resin into a cavity formed by closing the upper mold in the lower mold, it corresponds to the axis position of the stator. A resin inlet provided in the upper die, a central convex portion provided at the center of the concave portion of the lower die corresponding to the inner peripheral side of the stator, and between the central convex portion and the upper die in the mold closed state. A gap portion that is formed and serves as a passage for the resin supplied from the resin injection port to the winding, a narrowest portion where the gap portion is narrowest at the outer peripheral end of the central convex portion, and a gap portion that is injected from the resin injection port In order to push up the unnecessary resin solidified by And purpose that a resin pushing-up means.

  According to the configuration of the invention described above, a gap portion serving as a resin passage is formed between the central convex portion provided in the concave portion of the lower die and the upper die in the mold closed state. Then, the resin injected from the upper mold resin injection port provided corresponding to the axial position of the stator flows through the gap in all directions around the resin injection port, and the cavity in which the winding is accommodated To be supplied. At this time, since the gap portion is narrowest at the narrowest portion at the outer peripheral end of the central convex portion, the flow of resin into the cavity is moderately regulated at the narrowest portion. Thereafter, in the process of solidifying the resin flowing into the cavity, the resin injected into the gap from the resin injection port is also solidified as an unnecessary resin. In this unnecessary resin, the weakest thinnest part is formed at the narrowest part. Therefore, by moving the resin-sealed stator and the unnecessary resin relative to each other, the unnecessary resin is easily broken at the thinnest portion and separated from the stator. Further, the unnecessary resin push-up means provided through the central convex portion is activated, whereby the unnecessary resin is pushed up from the central convex portion.

  In order to achieve the above object, the invention according to claim 2 is the stator extrusion for extruding the resin-sealed stator provided in the lower mold and resin-sealed from the recess in the mold open state. The unnecessary resin push-up means further pushes up later than the stator push-out means.

  According to the configuration of the invention described above, in addition to the operation of the invention described in claim 1, the stator-extruding means is operated in the mold open state, whereby the resin-sealed stator is pushed out from the recess. Here, since the unnecessary resin push-up means is pushed up later than the stator push-out means, if the unnecessary resin is pushed up after the stator is pushed out, the stator and the unnecessary resin move relative to each other. Thereby, the unnecessary resin is broken at the thinnest portion and separated from the stator, and then the unnecessary resin is pushed up from the central convex portion.

  In order to achieve the above object, the invention described in claim 3 is the invention described in claim 1 or 2, wherein the invention protrudes from the central convex portion and is fixed to the lower mold, and in the resin injection port in the mold closed state. It is intended to further include fastening means for fastening to the disposed and solidified resin.

  According to the configuration of the invention, in addition to the operation of the invention according to claim 1 or 2, the fastening means protruding from the central convex portion is disposed in the resin injection port in the mold closed state. In the process of solidifying the resin supplied to the resin injection port, the solidified resin is fastened to the fastening means. Therefore, when the mold is subsequently opened, unnecessary resin is held to the central convex portion by the fastening means.

  In order to achieve the above object, according to a fourth aspect of the present invention, in the invention of the third aspect, the unnecessary resin push-up means is a cylindrical push-up means that is slidable with respect to the fastening means on the outer periphery of the fastening means. The purpose is to include.

  According to the configuration of the above invention, in addition to the action of the invention according to claim 3, when the unnecessary resin push-up means operates, the cylindrical push-up means slides on the outer periphery of the fastening means. Since it is pushed up, breakage of unnecessary resin is suppressed around the fastening means.

  In order to achieve the above object, the invention according to claim 5 is formed by disposing a stator having a winding on the inner peripheral side in a recess of a lower mold and closing the upper mold and the lower mold. The resin is injected into the cavity, and the resin is solidified to seal the winding. After that, the upper mold and the lower mold are opened, and then the resin-sealed stator is removed from the lower mold. In the resin molding method of the stator, in the process of resin sealing after mold closing, the unnecessary resin that solidifies on the upper side of the stator is fastened to the lower mold by fastening means, and the thinnest part is molded on the outer periphery of the unnecessary resin Then, in the mold open state after resin sealing, the resin-sealed stator is extruded from the recess by the stator extrusion means, and the unnecessary resin fastened in the process of extrusion is broken at the thinnest part from the stator. Separate and And purpose that push up from the lower mold by unnecessary resin pushing means against the fastening unnecessary resin later than extrusion data.

  According to the configuration of the invention, in the process of resin sealing after mold closing, the unnecessary resin solidified on the upper side of the stator is fastened to the lower mold by the fastening means, and is thinnest on the outer periphery of the unnecessary resin. Part is molded. Thereafter, the resin-sealed stator is extruded from the recess by the stator push-out means in the mold open state after the resin sealing. In this extrusion process, the unnecessary resin that has been fastened is separated from the stator by being broken at the thinnest portion. Then, the unnecessary resin is pushed up from the lower mold by the unnecessary resin push-up means against the fastening after the stator is pushed out. Therefore, in the process in which the resin-sealed stator is pushed up from the recess of the lower mold, the unnecessary resin is separated from the stator, and the separated unnecessary resin is pushed up from the lower mold.

  According to the first aspect of the present invention, the unnecessary resin solidified in the process of resin-sealing the stator can be easily separated from the lower mold and removed. Further, the stator can be resin-sealed with good quality.

  According to the second aspect of the invention, in addition to the effect of the first aspect, the unnecessary resin can be easily separated from the central convex portion and removed in the process of pushing out the resin-sealed stator from the lower mold. .

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the unnecessary resin can be easily separated from the upper mold when the mold is opened.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the unnecessary resin can be reliably pushed up from the central convex portion with a fixed shape.

  According to the fifth aspect of the present invention, the unnecessary resin solidified in the process of resin-sealing the stator can be easily removed from the lower mold in the process of separating the stator from the lower mold.

  Hereinafter, an embodiment embodying a resin molding apparatus and a resin molding method for a stator according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view showing the main configuration of a resin molding apparatus 1 in this embodiment. The resin molding apparatus 1 includes an upper mold 3 and a lower mold 4 (FIG. 1 shows a mold open state) and a lower mold 4 that are closed and opened with each other in order to seal the motor stator 2 as a workpiece. Are provided with a base 5 and upper and lower eject plates 6 and 7. The stator 2 is manufactured by attaching the winding 9 to the stator core 8 in advance.

  The upper mold 3 is provided so as to be movable up and down by a predetermined actuator (not shown). For example, a hydraulic cylinder or an air cylinder is used as the actuator. The upper mold 3 includes a thick plate-like base frame 10 and a mold member 11 assembled to the base frame 10. The base frame 10 is composed of two metal blocks 12 and 13 combined with each other. On the lower side of the mold member 11, a concave portion 14 constituting the cavity K (see FIGS. 5, 6, and 8) is formed. At the center of the mold member 11, a resin injection port 15 for injecting resin into the cavity K is formed corresponding to the axial center position of the stator 2. The resin injection port 15 opens to the recess 14 and is formed perpendicular to the recess 14 and has a substantially conical shape. The base frame 10 is provided with a resin passage 16 that communicates with the resin injection port 15. Resin is supplied to the resin passage 16 from outside at high pressure. The resin supplied to the resin passage 16 is injected into the cavity K from the resin injection port 15.

  FIG. 2 is a plan view schematically showing the lower mold 4. As shown in FIGS. 1 and 2, the lower mold 4 includes a base frame 23 composed of a plurality of metal blocks 21 and 22 combined with each other, a mold member 24 assembled on the upper side of the base frame 23, and a base frame 23. And a plurality of eject pins 26, 27, 27A provided to be movable up and down in the formed pin holes 25a to 25d. The lower mold 4 is supported on the base 5 via a machine base (not shown). Of the two eject plates 6 and 7, the lower eject plate 7 has a plurality of legs 7a extending downward. These legs 7a are assembled in the guide hole 5a of the base 5 so as to be movable up and down. Each guide hole 5a is provided with a protruding pin 28 that protrudes to move the leg 7a up and down. Each protruding pin 28 is provided so as to be movable up and down by a predetermined actuator (not shown). For example, a hydraulic cylinder or an air cylinder is used as the actuator.

  On the upper side of the mold member 24 of the lower mold 4, a recess 29 constituting the cavity K is formed. At the center of the concave portion 29, a center post 30 that protrudes upward corresponding to the central convex portion of the present invention is provided. The recess 29 has an annular shape around the center post 30. The pin holes 25a and 25b described above are opened on the bottom surface of the recess 29, and the tip of the stator eject pin 26 for pushing the stator 2 out of the recess 29 through the pin holes 25a and 25b is provided so as to be able to appear and retract. The stator eject pin 26 constitutes a stator push-out means of the present invention.

  In FIG. 2, for convenience, eight stator eject pins 26 are illustrated in the recesses 29, and some of them are illustrated in FIG. 1, but actually eight or more stator eject pins 26 are provided. The number and arrangement of the stator eject pins 26 are design items determined as necessary. The base end portion of each stator eject pin 26 is fixed to the two eject plates 6 and 7. Accordingly, when the protruding pins 28 move up and down, the two eject plates 6 and 7 move up and down via the legs 7a. As a result, the stator eject pins 26 move up and down all at once, and their tips protrude from the recesses 29.

  As shown in FIG. 2, a plurality of pin holes 25c, 25d are also opened on the upper surface of the center post 30, and the spool F (FIG. 10) generated from the pin holes 25c, 25d above the center post 30 during resin molding. The tip portions of the spool eject pins 27, 27A for pushing up are provided so as to be able to appear and retract. The spool eject pins 27 and 27A constitute unnecessary resin push-up means of the present invention. FIG. 3 is a plan view showing the upper surface of the center post 30. The spool eject pin 27A located at the center of the center post 30 has a cylindrical shape, and the spool lock pin 31 is disposed inside thereof. The cylindrical spool eject pin 27A is hereinafter referred to as a “cylindrical spool eject pin” in order to distinguish it from others. The cylindrical spool eject pin 27A corresponds to the cylindrical push-up means of the present invention. A plurality of rod-like spool eject pins 27 are arranged around the cylindrical spool eject pin 27A. 2 and 3 show three spool eject pins 27 for convenience, but actually three or more spool eject pins 27 are provided. The number and arrangement of the spool eject pins 27 are design matters determined as necessary. A proximal end portion of the spool lock pin 31 is fixed to the base 5. The cylindrical spool eject pin 27 </ b> A and the base end portion of the spool eject pin 27 are assembled to the two eject plates 6 and 7.

  FIG. 4 is an enlarged cross-sectional view showing the configuration of the portion indicated by the chain line circle S1 in FIG. 1, that is, the base end portions of the cylindrical spool eject pin 27A, the spool eject pin 27, and the spool lock pin 31. The base 5 and the two eject plates 6 and 7 are formed with pin holes 5b, 6a, 6b, 7b and 7c through which the cylindrical spool eject pin 27A, the spool eject pin 27 and the spool lock pin 31, respectively, pass. The pin hole 5b of the base 5 corresponding to the spool lock pin 31 is a two-stage hole having different inner diameters in the vertical direction. The pin hole 7b of the lower eject plate 7 corresponding to the cylindrical spool eject pin 27A has a two-step hole having different inner diameters in the vertical direction and has a step 7d. The pin hole 7b has a large diameter on the upper side and a small diameter on the lower side. A cylindrical slide pin 32 having an upper flange 32a is incorporated in the pin hole 7b so as to be movable up and down. The slide pin 32 has an upper flange 32a that contacts the lower surface of the cylindrical spool eject pin 27A, and a lower slide pin 32 that can slide up and down the pin hole 7b in a range where the flange 32a contacts the step 7d of the pin hole 7b. The cylindrical spool eject pin 27 </ b> A is assembled through the pin hole 6 a of the upper eject plate 6. A flange 27a is formed at the lower end of the cylindrical spool eject pin 27A, and the flange 27a can contact the lower surface of the upper eject plate 6. The cylindrical spool eject pin 27A is supported on the upper surface of the slide pin 32 by its flange 27a. Accordingly, when the slide pin 32 moves up and down, the cylindrical spool eject pin 27A also moves up and down accordingly. The cylindrical spool eject pin 27A has a structure in which the flange 27a hits the upper eject plate 6 or the flange 32a of the slide pin 32 hits the step 7d of the pin hole 7b. The relative movement between them is regulated. The spool lock pin 31 is assembled through the cylindrical spool eject pin 27A and the slide pin 32. An enlarged diameter portion 31 a is formed at the proximal end portion of the spool lock pin 31. The enlarged diameter portion 31 a is fitted into the pin hole 5 b of the base 5 and fixed.

  Also, the pin hole 7c of the lower eject plate 7 corresponding to the spool eject pin 27 is a two-step hole having a different inner diameter in the vertical direction, and has a step 7e. The pin hole 7c has a large diameter on the upper side and a small diameter on the lower side. A cylindrical stopper 27 b is provided at the lower end of the spool eject pin 27. The spool eject pin 27 is assembled through the pin holes 6b and 7c of the two eject plates 6 and 7. A stopper 27b is incorporated in the large diameter portion of the pin hole 7c of the lower eject plate 7 so as to be movable up and down. Accordingly, the spool eject pin 27 can move up and down as long as the stopper 27b hits the upper eject plate 6 on the upper side and the stopper 27b hits the step 7e of the pin hole 7c on the upper side. The relative movement is possible.

  FIG. 5 is a sectional view showing portions of the mold member 11 and the center post 30 in a state where the upper mold 3 and the lower mold 4 are closed. A lock portion 31 b that protrudes from the upper surface of the center post 30 is provided at the tip of the spool lock pin 31. The lock portion 31b has a shape in which a plurality of bulges are connected. The lock portion 31b is disposed so as to protrude into the resin injection port 15 of the mold member 11 when the mold is closed. The lock portion 31b is used to bite and lock (fasten) the resin solidified at the resin injection port 15 after resin molding, and corresponds to the fastening means of the present invention. As shown in FIG. 5, the tip end surface of the cylindrical spool eject pin 27 </ b> A in the standby state is flush with the upper surface of the center post 30. Further, as shown in FIG. 5, the upper end surface of the spool eject pin 27 in the standby state is disposed so as to be slightly submerged in the pin hole 25 d from the upper surface of the center post 30.

  As shown in FIG. 5, in the mold closed state, a gap 33 serving as a passage for the resin supplied from the resin injection port 15 to the cavity K is provided between the center post 30 and the mold surface of the recess 14 of the mold member 11. Is formed. Corresponding to the outer peripheral edge of the upper surface of the center post 30, the ridge 14 a is formed in an annular shape along the outer periphery of the center post 30 on the mold surface of the recess 14. The narrowest portion 33a where the gap portion 33 is the narrowest is between the outer peripheral end of the upper surface of the center post 30 and the ridge 14a.

  Therefore, as shown in FIG. 6, when resin Z is injected from the resin injection port 15 into the cavity K, the resin Z flows through the gap 33 in all directions around the resin injection port 15 and enters the cavity K. Supplied. At this time, since the gap portion 33 is narrowest at the narrowest portion 33a at the outer peripheral end of the upper surface of the center post 30, the inflow of resin into the cavity K is moderately regulated by the narrowest portion 33a. The resin also enters the drop portion 30a of the pin hole 25d of the spool eject pin 27. Thereafter, in the process in which the resin flowing into the cavity K is solidified, the resin Z injected into the gap 33 from the resin injection port 15 is also solidified as an unnecessary resin, and a spool F (see FIGS. 10 and 11 and the like) is formed. In the spool F, the thinnest portion Fa (see FIGS. 10 and 11, etc.) is formed at the narrowest portion 33 of the gap portion 33. Further, the resin that has entered the drop portion 30 a of the pin hole 25 d is solidified, whereby the spool F is locked to the upper surface of the center post 30. Further, the resin Z solidified in the resin inlet 15 bites into the lock portion 31b of the spool lock pin 31 and is fastened.

  Next, a resin molding method performed using the above-described resin molding apparatus 1 will be described with reference to FIGS. 1 and 7 to 18. To resin-seal the stator 8 using the resin molding apparatus 1, first, in the mold open state shown in FIG. 1, the stator 8 is first disposed in the recess 29 of the lower mold 4 as shown in FIG. 7.

  Thereafter, as shown in FIG. 8, the upper die 3 and the lower die 4 are closed to form a cavity K between the upper die 3 and the lower die 4, and the stator 2 is sealed in the cavity K. House in state.

  Thereafter, as shown in FIG. 9, the molten resin Z is supplied to the resin passage 6 of the upper mold 3 at a high pressure. As a result, the resin is injected into the cavity K through the resin injection port 15 and the gap 33, and the resin is supplied to the winding 9 accommodated in the cavity K. In this embodiment, a thermosetting resin is used as the resin. The molten resin Z is heated to a temperature of 40 to 50 ° C., and the mold members 11 and 24 are heated to a temperature of 150 to 160 ° C. At this time, as shown in FIG. 6, the resin Z supplied from the resin injection port 15 passes through the gap 33 between the upper surface of the center post 30 and the mold member 11 in all directions outside the resin injection port 15. Into the cavity K containing the winding 9. At this time, since the gap portion 33 is narrowest at the narrowest portion 33a, the inflow of resin into the cavity K is moderately regulated by the narrowest portion 33a. As a result, the resin can be spread evenly over all the windings 9 of the stator 2 and sealed.

  Thereafter, in order to separate the resin-sealed stator 2 from the lower mold 4, first, as shown in FIG. 10, the upper mold 3 is moved upward to open the mold. FIG. 11 is an enlarged cross-sectional view of a portion surrounded by a chain line circle S4 in FIG. In this mold open state, an unnecessary disk-like spool F corresponding to the upper surface of the center post 30 remains integrally with the stator 2 at the upper center of the resin-sealed stator 2. The spool F includes a conical protrusion F1 formed by the resin injection port 15 at the center thereof. In the protrusion F1, the resin bites into the lock portion 31b and is fastened. Further, on the lower surface of the spool F, a part of the resin Z is engaged with the drop portion 30a of the pin hole 25d. Therefore, when the upper mold 3 is opened, the spool F and the protrusion F1 are locked to the lock portion 3ab and the drop-in portion 30a, and are fastened to the center post 30. For this reason, when the upper die 3 is opened, the spool F can be easily separated from the die member 11 of the upper die 3.

  Thereafter, in order to separate the resin-sealed stator 2 from the lower mold 4 and the spool F from the center post 30, as shown in FIGS. The two eject plates 6 and 7 are gradually moved upward through 7a. Thereby, the stator eject pin 26 and the spool eject pins 27 and 27A are sequentially moved upward simultaneously.

  That is, as shown in FIG. 12, only the stator eject pin 26 is moved by the two eject plates 6 and 7 moving upward until the projecting pin 28 is projected for about one third of the entire stroke. Moves upward, and only the resin-sealed stator 2 is pushed out from the recess 29 of the mold member 24. At this time, since the spool eject pins 27 and 27 </ b> A remain stopped, the unnecessary spool F remains on the upper surface of the center post 30. FIG. 13 is an enlarged cross-sectional view of a portion surrounded by a chain line circle S5 in FIG. At this time, since the stator 2 is pushed out of the recess 29 and moves relative to the spool F, the spool F is easily broken at the thinnest portion Fa. For this reason, it is possible to reliably separate the spool F from the stator 2 while keeping the circular shape without breaking the spool F carelessly.

  Here, even if the two eject plates 6 and 7 move, the spool eject pins 27 and 27A do not move because of the configuration related to the base end portions of the pins 27 and 27A. FIG. 14 is an enlarged cross-sectional view showing a portion of a chain line circle S2 in FIG. While the two eject plates 6 and 7 are being pushed up, the cylindrical spool eject pin 27A and the slide pin 32 move relative to the eject plates 6 and 7, as shown in FIG. That is, the cylindrical spool eject pin 27A and the slide pin 32 remain stopped until the flange 32a of the slide pin 32 hits the step 7d of the pin hole 7b of the lower eject plate 7. Similarly, as shown in FIG. 14, the spool eject pin 27 remains stopped until the stopper 27 b hits the step 7 e of the pin hole 7 c of the lower eject plate 7.

  Thereafter, as shown in FIG. 15, the protruding pin 28 is further protruded upward by the remaining stroke and the eject plates 6 and 7 are moved upward, whereby both the stator eject pin 26 and the spool eject pins 27 and 27A are moved. It will move upwards all at once. As a result, the stator 2 is further pushed out from the concave portion 29 of the lower mold 4, and the spool F is pushed up from the upper surface of the center post 30. FIG. 16 is an enlarged cross-sectional view of a portion surrounded by a chain line circle S6 in FIG. Thereby, the stator 2 is further pushed up from the concave portion 29 of the lower mold 4, so that the stator 2 is easily separated from the lower mold 4. Further, since the spool F is easily separated from the center post 30, it is easy to remove the unnecessary spool F from the lower mold 4. Further, since the cylindrical spool eject pin 27 pushes up the spool F while sliding on the outer periphery of the lock portion 31b, breakage of the spool F around the lock portion 31b is suppressed. In this sense as well, the spool F can be reliably separated from the center post 30 while maintaining a regular circular shape.

  Here, from the state shown in FIGS. 12 and 14, the spool eject pins 27 and 27 </ b> A are moved when the eject plates 6 and 7 are further moved according to the configuration related to the base ends of the pins 27 and 27 </ b> A. by. FIG. 17 is an enlarged cross-sectional view showing a portion of a chain line circle S3 in FIG. When the two eject plates 6 and 7 are moved further upward, the flange 32a of the slide pin 32 hits the step 7d of the pin hole 7b of the lower eject plate 7 as shown in FIG. The pin 27A and the slide pin 32 move upward together with the eject plates 6 and 7. Similarly, as shown in FIG. 17, since the stopper 27 b hits the step 7 e of the pin hole 7 c of the lower eject plate 7, the spool eject pin 27 moves upward together with the eject plates 6 and 7.

  That is, in this embodiment, by using the resin molding apparatus 1 described above, the spool F solidified at the upper center of the stator 2 in the process of resin sealing is spool-locked to the center post 30 of the lower mold 4. Fastened by the lock 31b of the pin 31. After the resin sealing is completed, the resin-sealed stator 2 is extruded from the concave portion 29 of the lower mold 4 with the stator eject pin 26 in a state where the upper mold 3 is opened from the lower mold 4, and the extrusion process is performed. Thus, the spool F fastened by the lock portion 31 b is separated from the stator 2. Thereafter, the spool F is pushed up from the center post 30 by the spool eject pins 27 and 27A against the fastening by the lock portion 31b after the pushing out of the stator 2. Thus, in the present embodiment, a resin molding method is adopted in which the spool F is automatically separated from the center post 30 in the process of pushing out and separating the resin-sealed stator 2 from the lower mold 4. For this reason, as shown in FIG. 18, the resin-sealed stator 2 can be easily detached from the resin molding apparatus 1, and the unnecessary spool F can be easily removed from the apparatus 1.

  As described above, according to the resin molding apparatus 1 of this embodiment, the center post 30 provided in the concave portion 29 of the mold member 24 of the lower mold 4 in the state where the upper mold 3 and the lower mold 4 are closed. A gap 33 serving as a resin passage is formed between the upper mold 3 and the mold member 11. Then, the resin injected from the resin injection port 15 of the mold member 11 provided corresponding to the axial center position of the stator 2 flows through the gap 33 in all directions around the resin injection port 14, and is wound. The wire 9 is supplied to the cavity K in which it is accommodated. At this time, since the gap portion 33 is narrowest at the narrowest portion 33a at the upper outer peripheral end of the center post 30, the inflow of resin into the cavity K is moderately regulated by the narrowest portion 33a. As a result, the resin can be spread evenly over all the windings 9 of the stator 2 and sealed. As a result, the stator 2 can be resin-sealed with good quality.

  Thereafter, in the process in which the resin flowing into the cavity K is solidified, the resin injected from the resin injection port 15 into the gap 33 is also solidified as an unnecessary spool F. In the spool F, the weakest thinnest portion Fa is formed at the narrowest portion 33a of the gap 33. Therefore, when the resin-sealed stator 2 moves relative to the spool F, the spool F is easily broken at the thinnest portion Fa and separated from the stator 2. The spool F is pushed up from the center post 30 by moving the spool eject pins 27 and 27A of the center post 30 upward. For this reason, the unnecessary spool F formed in the process of resin-sealing the stator 2 can be easily separated from the center post 30 of the lower mold 4 and removed.

  According to this embodiment, in the mold open state of the upper mold 3 and the lower mold 4, the stator eject pin 26 moves upward, so that the resin-sealed stator 2 becomes the recess 29 of the mold member 24 of the lower mold 4. Extruded from. Here, since the spool eject pins 27 and 27A are pushed up later than the stator eject pin 26, when the spool F is pushed up behind the pushing of the stator 2, the stator 2 and the spool F move relative to each other. Thereby, after the spool F is broken at the thinnest portion Fa and separated from the stator 2, the spool F is pushed up from the upper surface of the center post 30. For this reason, the spool F can be easily separated from the center post 30 and removed in the process of pushing out the resin-sealed stator 2 from the recess 29 of the lower mold 4.

  According to this embodiment, in a state where the upper mold and the lower mold 4 are closed, the lock portion 31 b of the spool lock pin 31 protruding from the center post 30 is located in the resin injection port 15 of the mold member 11 of the upper mold 4. Placed in. In the process of solidifying the resin supplied to the resin injection port 15, the solidified resin is fastened to the lock portion 31b. Further, the resin that has entered the drop portion 30 a of the pin hole 25 d is solidified on the upper surface of the center post 30, so that the spool F is locked to the upper surface of the center post 30. Therefore, when the upper die 3 is subsequently opened, the spool F is held to the center post 30 by the lock portion 31b and the drop portion 30a. For this reason, when the mold is opened, the spool F can be easily separated from the mold member 11 of the upper mold 3.

  According to this embodiment, when the spool eject pins 27 and 27A move upward, the cylindrical spool eject pin 27A slides on the outer periphery of the lock portion 31b, and thereby the spool F is pushed up. Accordingly, the spool F is prevented from being carelessly broken around the lock portion 31b. For this reason, the spool F can be reliably broken at the thinnest portion Fa, and the spool F can be reliably pushed up from the center post 30 in a regular circular shape.

  Further, according to the resin molding method of this embodiment, the unnecessary spool F that is solidified at the upper center of the stator 2 in the resin sealing process after the upper mold 3 and the lower mold 4 are closed is provided in the lower mold 4. The center post 30 is fastened by a lock portion 31b or the like, and the thinnest portion Fa is formed on the outer periphery of the spool F. Thereafter, the resin-sealed stator 2 is pushed out from the recess 29 of the lower mold 4 by the stator eject pins 26 in the mold open state of the upper mold 3 and the lower mold 4 after the resin sealing. In this extrusion process, the spool F fastened to the lock portion 31b or the like is separated from the stator 2 by being broken at the thinnest portion Fa. Then, the spool F is pushed up from the center post 30 of the lower die 4 by the spool eject pins 27 and 27A against the fastening after the stator 2 is pushed out. Therefore, in the process in which the resin-sealed stator 2 is pushed up from the recess 29 of the lower mold 4, the unnecessary spool F is separated from the stator 2 and the separated spool F is pushed up from the center post 30. For this reason, the unnecessary spool F formed in the process of resin-sealing the stator 2 can be easily separated from the lower mold 4 and removed in the process of separating the stator 2 from the lower mold 4.

  In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.

  For example, the number and arrangement of the stator eject pins 26 and the spool eject pins 27 shown in the embodiment can be appropriately changed as compared with the configuration of the embodiment. Further, the configuration for moving the stator eject pin 26 and the spool eject pins 27 and 27A up and down can be changed as appropriate. Further, in order to remove the resin-sealed stator 2 from the resin molding apparatus 1 or to remove the spool F separated from the stator 2 and separated from the center post 30 from the resin molding apparatus 1, they are picked up. A dedicated transport mechanism may be provided.

Sectional drawing which shows the main structures (initial mold opening state) of the resin molding apparatus. The top view which shows the outline of a lower mold | type. The top view which shows the upper surface of a center post. Sectional drawing which expands and shows the part of the chain line circle | round | yen S1 of FIG. Sectional drawing which shows the part of the upper mold member and center post in the mold closed state. Sectional drawing which shows the part of the upper mold member and center post at the time of resin injection. Sectional drawing which shows the main structures (stator arrangement | positioning state) of a resin molding apparatus. Sectional drawing which shows the main structures (mold closing state) of the resin molding apparatus. Sectional drawing which shows the main structures (resin injection state) of a resin molding apparatus. Sectional drawing which shows the main structures (mold opening state after shaping | molding) of the resin molding apparatus. Sectional drawing which expands and shows the part of the chain line circle | round | yen S4 of FIG. Sectional drawing which shows the main structures (spool isolation | separation state) of a resin molding apparatus. Sectional drawing which expands and shows the part of the chain line circle | round | yen S5 of FIG. Sectional drawing which expands and shows the part of the chain line circle | round | yen S2 of FIG. Sectional drawing which shows the main structures (spool mold release state) of the resin molding apparatus. Sectional drawing which expands and shows the part of chain line circle | round | yen S6 of FIG. Sectional drawing which expands and shows the part of the chain line circle | round | yen S3 of FIG. Sectional drawing which shows the main structures (spool etc. removal state) of the resin molding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin molding apparatus 2 Stator 3 Upper mold | type 4 Lower mold | type 9 Winding 15 Resin inlet 26 Stator eject pin (stator extrusion means)
27 Spool eject pin (unnecessary resin push-up means)
27A Cylindrical spool eject pin (unnecessary resin push-up means, cylindrical push-up means)
29 Concave part 30 Center post (central convex part)
31b Locking part (fastening means)
33 Gap 33a Narrowest Z Resin F Spool (unnecessary resin)
Fa Thinnest part K Cavity

Claims (5)

An upper mold and a lower mold for closing and opening the mold are provided, and a stator having a winding provided on the inner peripheral side is disposed in the recess of the lower mold, and the upper mold is closed with the lower mold. In the resin molding apparatus of the stator that is configured to resin-seal the winding of the stator by injecting resin into the cavity,
A resin injection port provided in the upper mold corresponding to the axial position of the stator;
A central convex portion provided at the center of the concave portion of the lower mold corresponding to the inner peripheral side of the stator;
A gap formed between the central convex portion and the upper mold in the mold closed state and serving as a passage for a resin supplied from the resin injection port to the winding;
The narrowest part where the gap is narrowest at the outer peripheral end of the central convex part;
An unnecessary resin push-up means provided in the lower mold through the central convex portion to push up the unnecessary resin injected from the resin injection port and solidified in the gap portion. Resin molding equipment. A stator push-out means is further provided for pushing out the stator sealed with resin from the recess in the mold open state, and the unnecessary resin push-up means pushes up later than the stator push-out means. The resin molding apparatus for a stator according to claim 1. 2. The apparatus according to claim 1, further comprising fastening means that protrudes from the central convex portion, is fixed to the lower mold, is disposed in the resin inlet in the closed state, and fastens to the solidified resin. 2. A resin molding apparatus for a stator according to 2. 4. The resin molding apparatus for a stator according to claim 3, wherein the unnecessary resin push-up means includes a cylindrical push-up means that is slidable with respect to the fastening means on an outer periphery of the fastening means. By placing a stator having a winding on the inner peripheral side in the recess of the lower mold, injecting resin into the cavity formed by closing the upper mold and the lower mold, and solidifying the resin In the resin molding method of the stator in which the winding is resin-sealed, and then the upper mold and the lower mold are opened, and then the resin-sealed stator is taken out from the lower mold.
In the process of resin sealing after the mold closing, the unnecessary resin solidified on the upper side of the stator is fastened to the lower mold by a fastening means, and the thinnest part is formed on the outer periphery of the unnecessary resin,
In the mold open state after the resin sealing, the resin-sealed stator is extruded from the recess by the stator pushing means, and the fastened unnecessary resin is broken at the thinnest portion in the process of the extrusion. To separate from the stator,
A method for molding a resin of a stator, wherein the unnecessary resin is pushed up from the lower mold by an unnecessary resin push-up means against the fastening after the stator is pushed out.

Images